feat: checkpoint batching and release-gate stories

.scratch/distributed-gguf-runtime/evidence/DGR-013/commands.txt

@@ -0,0 +1,36 @@
+# DGR-013 — exact commands and real results (worktree venv)
+VP=/run/media/popov/d/DEV/repos/d-popov.com/AI/.venv/bin/python
+
+# Targeted story tests (this story)
+$VP -m pytest -q tests/test_failure_semantics.py
+# -> 22 passed
+
+# Dependency gates stay green
+$VP -m pytest -q tests/test_batch_scheduler.py        # DGR-012
+# -> 16 passed
+$VP -m pytest -q tests/test_hot_kv_state.py           # DGR-007
+# -> 22 passed
+$VP -m pytest -q tests/test_gguf_backend.py           # DGR-009
+# -> 2 passed
+
+# Quality gates
+$VP -m compileall -q packages tests
+# -> exit 0
+git diff --check
+# -> exit 0
+
+# Machine-readable evidence
+$VP .scratch/distributed-gguf-runtime/evidence/DGR-013/generate_evidence.py
+# -> wrote results.json; work statuses {'completed':2,'cancelled':1,'failed':0,'unverified':2} billable_tokens=16
+
+# Full deterministic suite
+$VP -m pytest -q -p no:cacheprovider
+# -> 16 failed, 792 passed, 14 skipped in 253.93s
+
+# Clean-tree reproduction of the 16 pre-existing failures (DGR-013 files removed)
+# rm packages/node/meshnet_node/failure_semantics.py tests/test_failure_semantics.py
+$VP -m pytest -q tests/test_dynamic_routing.py::test_admin_can_replace_a_served_model_and_release_it \
+  tests/test_node_doctor.py::test_the_shipped_recipes_are_all_applicable_by_the_backend \
+  tests/test_tracker_routing.py::test_torch_node_applies_tracker_load_shard_directive \
+  tests/test_node_startup.py::test_preset_model_with_hf_repo_loads_torch_backend
+# -> 4 failed (same failures reproduce without any DGR-013 change)